Bump timeout for testing-farm watch

Before we ran into many timeouts after 5 seconds. Let's hope waiting
longer fixes the issue.

snapshot_manager/snapshot_manager/testing_farm_util.py

@@ -223,7 +223,7 @@ def watch(self) -> tuple["TestingFarmWatchResult", str]:
         request_id = sanitize_request_id(request_id=self.request_id)
         cmd = f"testing-farm watch --no-wait --id {self.request_id}"
         # We ignore the exit code because in case of a test error, 1 is the exit code
-        _, stdout, stderr = util.run_cmd(cmd=cmd)
+        _, stdout, stderr = util.run_cmd(cmd=cmd, timeout_secs=20)
         watch_result, artifacts_url = TestingFarmWatchResult.from_output(stdout)
         if watch_result is None:
             raise SystemError(